//
// Do NOT modify or remove this copyright and license
//
// Copyright (c) 2019 - 2020 Seagate Technology LLC and/or its Affiliates, All Rights Reserved
//
// This software is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
// ******************************************************************************************
// 
// \file asmedia_nvme_helper.h
// \brief Defines the functions for ASMedia NVMe-USB pass-through

//All code in this file is from a ASMedia USB to NVMe product specification for pass-through nvme commands.
//This code should only be used on products that are known to use this pass-through interface.
//NOTE: There are 2 possible pass-through types for ASMedia. 1. Limited/basic capability to get identify and log page data (most common) and 2. a full pass-through capability (not supported on every device)
//      This file contains both. It is not clear how to determine if the full packet passthrough is supported other than trying it.

#pragma once

#if !defined (DISABLE_NVME_PASSTHROUGH)

#include "nvme_helper.h"
#include "scsi_helper.h"

#if defined (__cplusplus)
extern "C"
{
#endif

    //Documentation shows that the inquiry data sets an additional product identifier in bytes 36 & 37.
    //These defines are below. These values will only show when reading EXACTLY 38 bytes of std inquiry data.
#define INQ_ADPID_B36 UINT8_C(0x60)
#define INQ_ADPID_B37 UINT8_C(0x23)

    ////////////////////////////////////
    // ASMEDIA Basic NVMe passthrough //
    ////////////////////////////////////

#define ASMEDIA_NVME_PASSTHROUGH_OP UINT8_C(0xE6)
#define ASMEDIA_NVME_PT_NVME_OP_OFFSET 1
#define ASMEDIA_NVME_PASSTHROUGH_CDB_SIZE UINT8_C(16)

    int send_ASMedia_Basic_NVMe_Passthrough_Cmd(nvmeCmdCtx *nvmCmd);

    /////////////////////////////////////
    // ASMEDIA Full packet passthrough //
    /////////////////////////////////////

    //ASMedia also has some other packet commands described below here.
#define ASMEDIA_NVME_PACKET_WRITE_OP UINT8_C(0xEA)
#define ASMEDIA_NVME_PACKET_READ_OP UINT8_C(0xEB)
#define ASMEDIA_NVME_PACKET_SIGNATURE UINT8_C(0x5A)
#define ASMEDIA_NVME_PACKET_OPERATION_OFFSET 2
#define ASMEDIA_NVME_PACKET_PARAMETER_1_OFFSET 3
#define ASMEDIA_NVME_PACKET_PARAMETER_2_OFFSET 4
#define ASMEDIA_NVME_PACKET_CDB_SIZE UINT8_C(16)

    typedef enum _eASM_NVMPacket_Operation
    {
        ASMEDIA_NVMP_OP_POWER_DOWN_NVME = 0x00,//ND (w) - param 1 used to control shutdown process. Only useful if power control circuit is present
        ASMEDIA_NVMP_OP_RESET_BRIDGE = 0x01,//ND (w) - no params
        ASMEDIA_NVMP_OP_GET_BRIDGE_INFO = 0x02,//R - no params, returns 64B of data. USB SN, VID, PID, PCIe detection, PCIe speed, PCIe lane width, power control of PCIe
        ASMEDIA_NVMP_OP_CONTROL_LED = 0x03,//ND (w) - param 1 controls operations mode of LED
        ASMEDIA_NVMP_OP_RELINK_USB = 0x04,//ND (w) - param 1 controls NVMe shutdown process before relink
        //Below operations are for NVM packet passthrough. Max transfer is 128KB in provided documentation, but may have previously been different based on revision history.
        ASMEDIA_NVMP_OP_SEND_ADMIN_IO_NVM_CMD = 0x80,//W
        ASMEDIA_NVMP_OP_DATA_PHASE = 0x81,//R | W
        ASMEDIA_NVMP_OP_GET_NVM_COMPLETION = 0x82,//R
    }eASM_NVMPacket_Operation;

    //These are parameter 1 values for power down operation
#define ASM_NVMP_PWR_WITHOUT_SHUTDOWN   UINT8_C(0)
#define ASM_NVMP_PWR_WITH_SHUTDOWN      UINT8_C(1)

    //These are parameter 1 values for LED
#define ASM_NVMP_LED_OFF    UINT8_C(0)
#define ASM_NVMP_LED_ON     UINT8_C(1)
#define ASM_NVMP_LED_BLINK  UINT8_C(2)

    //These are parameter 1 values for Relink
#define ASM_NVMP_RELINK_NO_SHUTDOWN UINT8_C(0)
#define ASM_NVMP_RELINK_NORMAL_SHUTDOWN UINT8_C(1)

    //Process for NVM packet passthrough command:
    //1. Send 64B of command data
    //2. perform data phase (even for non-data, send with length set to 0)
    //3. read 16 B of command completion data
    //Other notes: metadata is reserved, data pointer and CID will be modified by the bridge. Must be 512B aligned transfers according to documentation.
    //If command completion data bytes 14 & 15 are FFh, then entry is invalid and no NVMe command was sent or executed.
    //Data phase/direction parameter should match for all 3 steps of packet passthrough

#define ASM_NVMP_DWORDS_DATA_PACKET_SIZE UINT8_C(64) //Size of packet for NVMe DWORDS
#define ASM_NVMP_RESPONSE_DATA_SIZE UINT8_C(16) //size of NVM completion results

    //Parameter 1 values for packet passthrough of NVM command
#define ASM_NVMP_SEND_CMD_ADMIN UINT8_C(0)
#define ASM_NVMP_SEND_CMD_IO UINT8_C(1)

    //Parameter 2 values for packet passthrough of NVM command
#define ASM_NVMP_NON_DATA UINT8_C(0)
#define ASM_NVMP_DATA_IN UINT8_C(1)
#define ASM_NVMP_DATA_OUT UINT8_C(2)

    int send_ASM_NVMe_Cmd(nvmeCmdCtx *nvmCmd);

    int asm_nvme_Reset(tDevice *device);

    int asm_nvme_Subsystem_Reset(tDevice *device);

#if defined (__cplusplus)
}
#endif

#endif //DISABLE_NVME_PASSTHROUGH